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Yup, just a strap folded to have a hook at the top that fits neatly over the plate. Possibly doesn't need to hang too far down the back either, and would probably have plenty of pressure to keep the...

How about having the unit/enclosure hanging on a wide, or possibly 2, lightweight straps that hang it down the back of the plate, maybe even a magnet to keep it flush on the plate. Make the straps...